Originally Posted by grizz1

Yep, it's that simple. GO make a short needle for their carb. Some countries import the motors with the short needle (USA) while most other importers opt for the original long needle. If you are in the US just order an LSN off one of the distributors - it will be a short needle. If outside the US contact your local distributor and ask for a 21-2003-A which is the short needle replacement.
You could also just cut down your long needle from 1.6" to 1.42" with a rounded end. It will work fine. Your carb will then tune like a Nova or any other carb. Ask back here for base settings if you change needles.